<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        var arr = [4, 5, 6, 8, 22];
        var max = arr[0];
        var index = 0;
        for (let i = 0; i < arr.length; i++) {
            if (arr[i] > max) {
                max = arr[i];
                index = i;
            }
        }
        console.log('数组的最大值为：' + `${max}`);
        console.log(index);
    </script>
</body>

</html>